Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.
Each plate preceded by leaf with descriptive letterpress included in pagination
Bibliography: pt. 1, p. 19; pt. 2, p. 57-58
pt. 1. With especial reference to the "accessory chromosome".--pt. 2. A comparative study of the heterochromosomes in certain species of Coleoptera, Hemiptera and Lepidoptera, with especial reference to sex determination